Device for register-maintaining alignment of a flexible printing

Details Device for register-maintaining alignment of a flexible printing Device for register-maintaining alignment of a flexible printing

1985-10-24

1986-08-05

Fisher, J. Reed

Printing

Flexible-sheet-securing devices

101DIG12, B41F 2706, B41F 2712, B41F 3300

Patent

active

046036415

ABSTRACT:
A device for register-maintaining alignment of a flexible printing plate of a plate cylinder of a rotary printing machine, the plate cylinder being formed with a cylinder channel, tensioning rails being disposed in the channel and clamping rails for firmly clamping a respective end of the printing plate on the tensioning rails, the tensioning rails being adjustable in peripheral direction of the plate cylinder by tensioning screws includes a device for scanning the position of the printing plate in vicinity of a leading edge of the printing plate, and an electrical display device for indicating the scanned position of the printing plate, the scanning device including sensors respectively engageable in register holes formed in the printing plate in vicinity of the leading edge of the printing plate, when the printing plate is placed upon the plate cylinder, a holder carrying the sensors and extending parallel to the axis of the plate cylinder within the cylinder channel, the sensors being pivotable in peripheral direction of the plate cylinder so that a displacement of the printing plate in peripheral direction of the plate cylinder results in a corresponding deflection of the sensors in the peripheral direction, and a measuring device operatively associated with the sensors for generating signals corresponding to a displacement of the printing plate in the peripheral direction.

REFERENCES:
patent: 3719142 (1973-03-01), Abe
patent: 3858512 (1975-01-01), Simeth
patent: 3882775 (1975-05-01), Lytge et al.

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